电流镜及其在多值I2L电路开关级设计中的应用

运用开关信号理论和有界算术运算理论，对电流镜的多种性质进行了讨论，并系统研究了利用电流镜实现电流信号的各种算术运算，其中倍除运算属于初次提出，最后通过N进制半加电路和N值比较电路等两个设计实例介绍了电流镜技术在I^2L电路开关级设计中的应用。     

图的L(3,2,1)-标号

无向图G的L(3,2,1)-标号是指从顶点集V(G)到非负整数集Z*的一个映射,满足:对i=1,2,3,只要dG(x,y)=i,则f(x)-f(y)|≥4-i.若一个L(3,2,1)-标号中的所有像元素都不超过整数k,则称之为k-L(3,2,1)-标号.图G的L(3,2,1)-标号数,记作3λ(G),是使得图G存在k-L(3,2,1)-标号的最小整数k.文中给出了路、圈、树等特殊图的L(3,2,1)-标号数,并给出了一般图的L(3,2,1)-标号数的一个上界.     

Grothendieck space ideals and weak continuity of polynomials on locally convex spaces

We introduce the classes of locally convex spaces with the local Dunford-Pettis property and locally dual Schur spaces. We examine their properties and their relationship to other classes of locally convex spaces. In the class of locally convex spaces with the local Dunford-Pettis property all polynomials are weakly sequentially continuous whereas in the class of locally dual Schur spaces all polynomials are weakly continuous on bounded sets. Research supported by Science Foundation Ireland, Basic Research Grant 2004.     

基于CPLD的VXI总线接口的研制

文章以VXI总线开关矩阵模块为例，介绍了其于可编程逻辑器件的VXIbus寄存器基接口的开发过程。给出了选用ALTERA公司的可编程逻辑器件FLEX 10K10在MAXPLUSII环境下，结合VXIbus时序对接口逻辑电路进行波形仿真和时序分析的方法。     

Consistency,stability, a priori and a posteriori errors for Petrov-Galerkin methods applied to nonlinear problems

Summary. In an abstract framework we present a formalism which specifies the notions of consistency and stability of Petrov-Galerkin methods used to approximate nonlinear problems which are, in many practical situations, strongly nonlinear elliptic problems. This formalism gives rise to a priori and a posteriori error estimates which can be used for the refinement of the mesh in adaptive finite element methods applied to elliptic nonlinear problems. This theory is illustrated with the example: in a two dimensional domain with Dirichlet boundary conditions. Received June 10, 1992 / Revised version received February 28, 1994     

Approximate unitary equivalence of completely distributive commutative subspace lattices

In this note, we classify completely distributive CSLs up to approximate unitary equivalence. Our proof uses a new characterization of complete distributivity and leads to a generalization of a result of Arveson on ordered group lattices. As consequences of our results, we obtain a similarity theorem for hyperreflexive, completely distributive CSLs and some new perturbation results.Partially supported by an NSERC grantResearch partially supported by NSF grant DMS-9204811.     

恒定pH系统中不同大麦品种的耐铝性

本文提出以相对生长率衡量耐铝性，基本上排除了系统所造成的误差.以相对生长率P衡量根的耐铝性，在恒定的pH系统(pH4. 75士0. 1)中3ppm铝胁迫下，经大田鉴定的一级耐性品种B和H表现了不同的相对生长率，品种B的相对生长率达28%，而品种H只有1400,中等敏感品种Z为15%，而敏感品种S可达17%.结果说明:品种H的耐铝性可能是通过升高根际pH，降低铝的解离程度而实现的.而品种B的耐铝性机制与品种H不同，其耐铝性与根际pH值调节基本无关.     

The K_2-groups over Finaite Commutative Rings

The present note determines the structure of the K2-group and of its subgroup over a finite commutative ring R by considering relations between R and finite commutative local ring Ri (1 < i < m), where R Ri and K2(R) = K2(Ri). We show that if charKi= p (Ki denotes the residual field of Ri), then K2(Ri) and its subgroups must be p-groups.     

Convergence to equilibrium for the Cahn–Hilliard equation with a logarithmic free energy

In this paper we investigate the asymptotic behavior of the nonlinear Cahn–Hilliard equation with a logarithmic free energy and similar singular free energies. We prove an existence and uniqueness result with the help of monotone operator methods, which differs from the known proofs based on approximation by smooth potentials. Moreover, we apply the Lojasiewicz–Simon inequality to show that each solution converges to a steady state as time tends to infinity.     

Large Sieve Inequality with Quadratic Amplitudes

In this paper, we develop a large sieve type inequality with quadratic amplitude. We use the double large sieve to establish non-trivial bounds.